Steam-turbine.



No.883,404., PATENTED MAR. 31, 1908.- P41. HEDLUND.

STEAM TURBINE.

APPLICATION FILED DEG-21,1907.

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PER .IOHAN HEDLUND, OF STOGKHOLM, SWEDEN.

. STEAM-TURBINE.

Specification of Letters Patent.

Patented March 31, 1908.

Application filed December 21, 1907. Serial No. 407,591.

To all whom "it may concern:

Be it known that I, PER J OHAN HEDLUND, engineer, subject of Sweden,residing at Jarla, Stockholm, Sweden, have invented new and usefulImprovements in Steam or Gas Turbines, of which the following is aspecification.

The present invention relates to steam or gas turbines of the kind, inwhich the turbine disk and the turbine casing rotate in oppositedirections.

The invention consists in the construction of the turbine casing and itscombination with the turbine disk, as more particularly pointed out inthe claims.

The drawing is a vertical transverse section of my'improved turbine.

The turbine casing is formed in two parts, each part comprising a diskand a substantially convex shell 6 connected thereto. The disk 4 forms awall of one part, and the disk 9 a wall of the other part, these disksbeing disposed facing one another and separated by a space in which isplaced the turbine disk 1. On one face of'said disk 1 are concentriccircular rows of buckets 3, and on the opposing face of disk 4 aresimilar concentric rows of buckets which enter between and alternatewith the bucket rows on disk 1. The parts of the casing are connected bythreaded flanged rings 8 bolted to the disks 4 and 9 in which rings areopenings for the exhaust. The hollow shaft 7 which may be integral withdisk 4, is threaded on its periphcry to receive a correspondinglythreaded hub on the shell 6 of the casing. The other part of the casinghas a hub extending through it, through which passes the shaft 2 whichcarries the turbine disk 1. The disks 4 and 9 are connected to thecasing shells 6 by bolts 10 and between said disks and shells are stayplates 12 some of which may be provided with sleeves 11 to receive saidbolts.

In operation, the motor fluid enters as shown by the arrows through thehollow shaft 7 and passes between the buckets in a direction radial tothe turbine disk and finally exhausts at the openings in rings 8; thecasing and the turbine disk 1 then rotating in o posite directions.

The f dregoing construction permits of the casing walls be1ng made thinand the whole casing structure is rendered rigid and comparativelylight.

I claim:

1. In an elastic fluid turbine, a turbine disk, and a casing for saidturbine disk formed in two parts each part comprising a disk and a shellconnected thereto.

2. In an elastic fluid turbine, a turbine disk and a casing formed intwo parts each part comprising a disk, a shell connected to said diskand internal stay plates connected to said shell and disk.

3. In an elastic fluid turbine, two shafts disposed end to end, aturbine disk carried by one of said shafts, and a casing carried by theother shaft: the said casing being formed in two parts, each comprisinga shell and a disk connected thereto, the said disks receiving theturbine disk between them.

4. In an elastic fluid turbine, a turbine disk, a casing completelyinclosing said disk, bucket rings on a face of said disk and on theopposing face of said casing, a hollow shaft carrying said casing and ashaft carrying said turbine disk and journaled in said casing the saidshafts being placed end to end.

5. In an elastic fluid turbine, an inclosing casing formed in two parts,each part comprising a disk and a shell connected thereto, a shaftsupporting said casing, a turbine disk interposed between said casindisks and a shaft carrying said turbine d1sk;the said turbine disk andone of the casin disks havin concentric alternately dispose rings of bucets on their opposing faces.

6. In an elastic fluid turbine, an inclosing casing formed in two parts,each part comprising a disk and a shell connected thereto, means forconnecting said disks at their circumferential peripheries, a shaftsupporting said casing, a turbine disk interposed be tween said casingandv a shaft carrying said turbine disk; the said turbine disk and oneof the casing disks having concentric alternately disposed rings ofbuckets on their opposing faces.

In testimony whereof I have signed my name to this specification in thepresence of two subscribin witnesses.

P R JOHAN HEDLUND.

Witnesses:

WARDEMAN BoMAN, HJALMAR ZETTERsTRoM.

